<title>Power Factor</title>
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<applet code=Circuit.class archive=circuit.jar width=640 height=450>
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<param name=pause value=20>
<param name=startCircuit value="powerfactor1.txt">
<param name=startLabel   value="Power Factor">
<param name=useFrame     value="false">
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<p>
This circuit shows an
inductor being driven by an AC voltage.<span style="mso-spacerun:
      yes">&nbsp; </span>The colors indicate power consumption; red means that
      a component is consuming power, and green means that the component is
      contributing power.<span style="mso-spacerun: yes">&nbsp; </span>The left
      side of the circuit represents the power company's side, and the right side
      represents a factory (with a large induction motor).<br>
      <br>
      The highly inductive load is causing the power company to work a lot
      harder than normal for a given amount of power delivered.</span><b><span
      style="mso-spacerun: yes">&nbsp; </span></b><span style='font-weight:
      normal'>The graph on the left indicates the power lost in the power
      company's equipment (the resistor at top left).<span style="mso-spacerun:
      yes">&nbsp; </span>The graph in the middle is the power delivered to the
      factory.<span style="mso-spacerun: yes">&nbsp; </span>The graph on the
      right is the power delivered to the inductor (and then returned, causing
      the time average of power delivered to be zero).<br>
      <br>
      Even though a peak power of 40 mW is being delivered to the factory, 200
      mW is being dissipated in the power company's wires.  This can
      happen whenever <a href="http://hyperphysics.phy-astr.gsu.edu/hbase/electric/powfac.html">power
      factor</a> is less than 1, and power companies usually charge
      extra when this happens.

<p>
Next: <a href="e-powerfactor2.html">Power Factor Correction</a><br>
Previous: <a href="e-inductkick-snub.html">Blocking Inductive Kickback</a><br>
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<br>Generated Tue Dec  7 2010
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